Document

We have acted as counsel to ARMOUR Residential REIT, Inc., a Maryland corporation (the “Company”), in connection with the registration and issuance by the Company of 21,275,000 shares of the Company’s common stock, par value $0.001 (the “Shares”), including 2,775,000 Shares that may be sold pursuant to the exercise of an option granted to the underwriters, in an underwritten public offering pursuant to a Registration Statement on Form S-3 (File No. 333-278327) (the “Registration Statement”), filed with the Securities and Exchange Commission (the “Commission”) under the Securities Act of 1933, as amended (the “Securities Act”), the related prospectus dated March 28, 2024 (the “Base Prospectus”) and the prospectus supplement dated August 5, 2025, filed with the Commission pursuant to Rule 424(b) of the Rules and Regulations (the “Prospectus Supplement”). The Base Prospectus and the Prospectus Supplement are collectively referred to as the “Prospectus.” The Shares are to be sold by the Company as described in the Registration Statement and the Prospectus.

We have acted as your counsel in connection with the preparation of the Prospectus Supplement. We are familiar with the proceedings taken by the Board of Directors of the Company in connection with the authorization, issuance and sale of the Shares. We have examined all such documents as we have considered necessary in order to enable us to render this opinion letter, including, but not limited to, (i) the Registration Statement, (ii) the Base Prospectus, dated March 28, 2024, included with the Registration Statement (the “Prospectus”), (iii) the Prospectus Supplement, (iv) the Company’s Articles of Incorporation, as amended, (v) the Company’s Bylaws, as amended, (vi) certain resolutions adopted by the Board of Directors of the Company, the Audit Committee of the Board of Directors of the Company and a Pricing Committee of the Company, (vii) corporate records and instruments, (viii) a specimen certificate representing the Shares, and (ix) such laws and regulations as we have deemed necessary for the purposes of rendering the opinion set forth herein. In our examination, we have assumed the genuineness of all signatures, the legal capacity of all natural persons, the authenticity of and conformity to originals of such documents that have been presented to us as duplicates or certified or conformed copies, the accuracy, completeness and authenticity of originals, the due execution and delivery of all documents (except that no such assumption is made as to the Company) where due execution and delivery are a prerequisite to the effectiveness thereof, and that the Shares will be issued against payment of valid consideration under applicable law. As to any facts material to the opinion expressed herein, which were not independently established or verified, we have relied, to the extent we have deemed reasonably appropriate, upon statements and representations or certificates of officers or directors of the Company.

The opinion expressed herein is limited to the corporate laws of the State of Maryland and we express no opinion as to the effect on the matters covered by the laws of any other jurisdiction. We assume no obligation to supplement this opinion letter if any applicable law changes after the date hereof or if we become aware of any fact that may change the opinion expressed herein after the date hereof.

We hereby consent to the filing of this opinion letter as part of the Registration Statement and to the reference of our firm under the caption “Legal Matters” in the Prospectus Supplement and to the filing of this opinion as an exhibit to a current report of the Company on Form 8-K, which is incorporated by reference in the Registration Statement and Prospectus. In giving such consent, we do not hereby admit that we are in the category of persons whose consent is required under Section 7 of the Act or the rules and regulations of the Commission.